What is teaspoon?
A teaspoon is a small cooking measurement used for ingredients such as spices, salt, baking powder, vanilla, oil and sauces. In practical UK kitchen maths, 1 teaspoon is usually treated as 5ml.
A teaspoon is a small kitchen measure used for small ingredient amounts. It is commonly used for seasonings, spices, extracts, baking powder, salt, sugar, oil and small liquid measurements.
For most UK cooking conversions, 1 teaspoon is treated as 5ml. It is also one third of a tablespoon, because 1 tablespoon is usually treated as 3 teaspoons.
Why teaspoons matter in recipes
Teaspoons are used when a recipe needs a small amount of an ingredient. A teaspoon of salt, baking powder, yeast, spice or vanilla can make a noticeable difference, so small measurements are often more important than they look.
They are especially common in baking, where small ingredient amounts can affect flavour, rise, texture and balance.
Common teaspoon equivalents
These are the practical equivalents used by most cooking calculators and kitchen conversion charts.
| Measure | Equivalent | Useful note |
|---|---|---|
| 1 teaspoon | 5ml | Standard practical kitchen conversion |
| 3 teaspoons | 1 tablespoon | Useful when scaling recipes |
| ½ teaspoon | 2.5ml | Common for spices and baking ingredients |
| ¼ teaspoon | 1.25ml | Often used for strong flavours or salt |
How to convert teaspoons to ml
To convert teaspoons to millilitres, multiply the number of teaspoons by 5.
For example, 2 teaspoons is 2 × 5 = 10ml. Half a teaspoon is 0.5 × 5 = 2.5ml.
How to convert teaspoons to grams
Teaspoons do not convert to grams in one fixed way. A teaspoon measures volume, while grams measure weight. That means a teaspoon of salt, sugar, oil, flour and cocoa powder can all weigh different amounts.
For a quick estimate, use the Cooking Unit Converter and choose the ingredient type where needed.
Teaspoons when scaling recipes
When you scale a recipe, teaspoon amounts can become awkward. For example, scaling 1 teaspoon by 1.5 gives 1.5 teaspoons, while scaling ¼ teaspoon by 2 gives ½ teaspoon.
This is where rounding matters. For strong ingredients such as salt, chilli, cinnamon or baking powder, it is often safer to round carefully and adjust by taste where appropriate.
Teaspoon vs tablespoon
A teaspoon is smaller than a tablespoon. In common kitchen conversions, 1 tablespoon equals 3 teaspoons. So if a recipe asks for 1 tablespoon and you only have a teaspoon, you would use 3 teaspoons.
| Question | Answer |
|---|---|
| How many ml is 1 teaspoon? | About 5ml |
| How many teaspoons are in 1 tablespoon? | 3 teaspoons |
| How many tablespoons is 1 teaspoon? | ⅓ tablespoon |
FAQs
How many ml is a teaspoon?
In practical UK cooking conversions, 1 teaspoon is usually treated as 5ml.
How many teaspoons are in a tablespoon?
There are usually 3 teaspoons in 1 tablespoon. This means 1 tablespoon is treated as 15ml and 1 teaspoon is treated as 5ml.
Can I convert teaspoons to grams?
Yes, but not with one fixed number for every ingredient. Teaspoons measure volume and grams measure weight, so the conversion depends on the ingredient.
Should I round teaspoon amounts when scaling a recipe?
For small amounts, round carefully. Strong ingredients such as salt, spices and raising agents can change the final result, so it is better to be cautious than to over-round.